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// Licensed to the Apache Software Foundation(ASF) under one
// or more contributor license agreements.See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
using System;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Thrift.Protocols;
using Thrift.Transports;
namespace Thrift.Server
{
//TODO: unhandled exceptions, etc.
// ReSharper disable once InconsistentNaming
public class AsyncBaseServer : TBaseServer
{
private readonly int _clientWaitingDelay;
private volatile Task _serverTask;
public AsyncBaseServer(ITAsyncProcessor processor, TServerTransport serverTransport,
ITProtocolFactory inputProtocolFactory, ITProtocolFactory outputProtocolFactory,
ILoggerFactory loggerFactory, int clientWaitingDelay = 10)
: this(new SingletonTProcessorFactory(processor), serverTransport,
new TTransportFactory(), new TTransportFactory(),
inputProtocolFactory, outputProtocolFactory,
loggerFactory.CreateLogger(nameof(AsyncBaseServer)), clientWaitingDelay)
{
}
public AsyncBaseServer(ITProcessorFactory itProcessorFactory, TServerTransport serverTransport,
TTransportFactory inputTransportFactory, TTransportFactory outputTransportFactory,
ITProtocolFactory inputProtocolFactory, ITProtocolFactory outputProtocolFactory,
ILogger logger, int clientWaitingDelay = 10)
: base(itProcessorFactory, serverTransport, inputTransportFactory, outputTransportFactory,
inputProtocolFactory, outputProtocolFactory, logger)
{
_clientWaitingDelay = clientWaitingDelay;
}
public override async Task ServeAsync(CancellationToken cancellationToken)
{
try
{
// cancelation token
_serverTask = Task.Factory.StartNew(() => StartListening(cancellationToken), TaskCreationOptions.LongRunning);
await _serverTask;
}
catch (Exception ex)
{
Logger.LogError(ex.ToString());
}
}
private async Task StartListening(CancellationToken cancellationToken)
{
ServerTransport.Listen();
Logger.LogTrace("Started listening at server");
if (ServerEventHandler != null)
{
await ServerEventHandler.PreServeAsync(cancellationToken);
}
while (!cancellationToken.IsCancellationRequested)
{
if (ServerTransport.IsClientPending())
{
Logger.LogTrace("Waiting for client connection");
try
{
var client = await ServerTransport.AcceptAsync(cancellationToken);
await Task.Factory.StartNew(() => Execute(client, cancellationToken), cancellationToken);
}
catch (TTransportException ttx)
{
Logger.LogTrace($"Transport exception: {ttx}");
if (ttx.Type != TTransportException.ExceptionType.Interrupted)
{
Logger.LogError(ttx.ToString());
}
}
}
else
{
try
{
await Task.Delay(TimeSpan.FromMilliseconds(_clientWaitingDelay), cancellationToken);
}
catch(TaskCanceledException) { }
}
}
ServerTransport.Close();
Logger.LogTrace("Completed listening at server");
}
public override void Stop()
{
}
private async Task Execute(TClientTransport client, CancellationToken cancellationToken)
{
Logger.LogTrace("Started client request processing");
var processor = ItProcessorFactory.GetAsyncProcessor(client, this);
TClientTransport inputTransport = null;
TClientTransport outputTransport = null;
TProtocol inputProtocol = null;
TProtocol outputProtocol = null;
object connectionContext = null;
try
{
inputTransport = InputTransportFactory.GetTransport(client);
outputTransport = OutputTransportFactory.GetTransport(client);
inputProtocol = InputProtocolFactory.GetProtocol(inputTransport);
outputProtocol = OutputProtocolFactory.GetProtocol(outputTransport);
if (ServerEventHandler != null)
{
connectionContext = await ServerEventHandler.CreateContextAsync(inputProtocol, outputProtocol, cancellationToken);
}
while (!cancellationToken.IsCancellationRequested)
{
if (!await inputTransport.PeekAsync(cancellationToken))
{
break;
}
if (ServerEventHandler != null)
{
await ServerEventHandler.ProcessContextAsync(connectionContext, inputTransport, cancellationToken);
}
if (!await processor.ProcessAsync(inputProtocol, outputProtocol, cancellationToken))
{
break;
}
}
}
catch (TTransportException ttx)
{
Logger.LogTrace($"Transport exception: {ttx}");
}
catch (Exception x)
{
Logger.LogError($"Error: {x}");
}
if (ServerEventHandler != null)
{
await ServerEventHandler.DeleteContextAsync(connectionContext, inputProtocol, outputProtocol, cancellationToken);
}
inputTransport?.Close();
outputTransport?.Close();
Logger.LogTrace("Completed client request processing");
}
}
}
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